Toxaphene residues in fish: identification, quantification, and confirmation at part per billion levels

Details are given of procedure developed for determination of chlorinated organic compounds by capillary column gas chromatography and mass spectrometry, which enables the determination of toxaphene in fish tissues at concentrations as low as 0.1 ug per g. The methods used for preparation of the samples removes most interferences, including all polychlorinated biphenyls.